Both .emb and .emd files are known to be used for embroidery / stitching formats, not for specific machines but software. Still, such formats are often adopted even in other software, but vendor specific formats will always be the mainstream formats.
It might be much easier to use some common exchange format, even SVG vector graphics, to convert/transfer the designs between different machines or embroidery software. But perhaps some tools support emb to emd conversion directly.
Updated: September 19, 2023